TAMPA — Free agency in Major League Baseball has gotten so ugly, even Giancarlo Stanton — the owner of the richest contract in the league’s history — says the current system has “issues” as another free-agency period has extended into spring training.

“It’s nothing like what I’ve seen since I’ve played, an offseason be like this,’’ Stanton said during a press conference Monday at George M. Steinbrenner Field. “I think there [are] some issues there that need to be addressed.’’

Stanton signed a monster 13-year, $325 million deal with the Marlins in November 2014 and when this offseason began, it seemed only a matter of time before Manny Machado or Bryce Harper would either approach that total value or break it.

While that could still happen, both stars remain unsigned, along with other significant names such as Craig Kimbrel and Dallas Keuchel.

Stanton’s back-loaded deal allowed him to avoid arbitration and included a full no-trade clause, which he used to his advantage when Derek Jeter’s new ownership group in Miami wanted to get rid of his contract.

That helped him land with the Yankees last offseason, but so far, Machado and Harper continue to look for new homes with position players reporting to spring training throughout the game.

Stanton said he was fortunate “big-time, for sure’’ to have signed the contract when he did instead of being a free agent in a second straight offseason of few mega deals.

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“If they break it, cool,” Stanton said. “I’ll be happy for them. But hopefully they can get signed. I don’t know what the deal is.’’

Stanton’s comments came a day after MLB commissioner Rob Manfred said it was “unfortunate” that players were making their displeasure regarding free agency public since the current collective bargaining agreement doesn’t expire until after the 2021 season.

On Monday, MLBPA head Tony Clark shot back at Manfred in a statement, saying Manfred’s “comments and his attempts to shift blame and distract from the main issues are unconstructive and misleading at best.’’